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  • Chemistry  (14)
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  • 1985-1989  (12)
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  • 1986  (12)
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  • 2015-2019  (2)
  • 1985-1989  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Some spectral and thermal contributions to the curing of new epoxy compounds with aromatic diamines (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1907-1914 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The curing reaction of the new bis(2,3-epoxypropyl) 4,4′-carbonyldi-ω-phthalimidoalkanoates 1a-c was studied with several aromatic diamines 2a-c as curing agents. The process was followed by means of spectrophotometric techniques. The influence of the nature of the curing agent on the reaction rate was examined. The adduct formation yielding first chain extension, is the first step of the reaction, followed by crosslinking, once the gel point has been reached. The products obtained were found to be rather thermostable.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870810
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  • 2
    Electronic Resource
    Electronic Resource
    On the preferential extraction of the more isotactic parts of PVC with acetone. A verification by 13C NMR analysis (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2649-2653 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Acetone-soluble and -insoluble fractions were obtained from two different PVC samples: a polymer prepared in our laboratory at 60°C using 2,2′-azoisobutyronitrile (AIBN) as initiator (sample A) and a commercial polymer prepared at 70°C (sample B). The content of isotactic, syndiotactic and heterotactic traids was accurately measured by high resolution 13C NMR. From the obtained data it follows that the isotactic triads accumulate preferably in the soluble fraction, the amount of which depends on the type of polymer. In agreement with earlier results, the soluble fraction is about 40% less stable than the insoluble fraction. The reasons for this behaviour are discussed in the light of the higher content of both isotactic triads and some defect structures, as found in the low molecular weight soluble extracts of PVC.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871114
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociation constant of poly(ethylene oxide) macroion pairs in nitrobenzene (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1367-1370 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The great stability of the cationic polymerization system, ethylene oxide/nitrobenzene, from an electrochemical point of view, was investigatd as well as the assumption that the stable salts of triphenylmethylium and the macroion pair have the same dissociation constant. The value was determined to be 9,4 · 10-3 mol · 1-1 at 293 K in nitrobenzene.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870605
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  • 4
    Electronic Resource
    Electronic Resource
    Configurational stereoselectivity in the nucleophilic substitution of poly(vinyl chloride) with sodium thiophenate: NMR study and Monte-Carlo simulation of the reaction (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 1753-1777 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nucleophilic substitution of the chlorine atoms of poly(vinyl chloride) with sodium thiophenate is assumed to obey an SN2 mechanism with inversion of configuration and a steric control according to which reactivities R of the triads follow the order Rmm 〉 Rmr ≫ Rrr. Such a reaction cannot be described by simple differential equations, but a Monte Carlo simulation, first generating a random Bernouillian chain and then simulating random attack of the chain by the reactant according to the triad reactivities, allows a good agreement with the experimental results of both the kinetics of a reaction carried out in cyclohexanone solution at 40°C and the evolution of the 13C and 1H NMR spectra of the tertiary carbon atoms, assuming the following parameters: Bernouillian probability for a meso placement in the initial chain: 0.431; relative reactivities of the mm, mr and rm, rr triads: 1, 0.5, and 0., respectively. The agreement is excellent until the reaction is about three-quarters complete; this shows a limiting level of about 60% substitution. Better agreement can be obtained up to the limit, if a secondary process of steric control by the substituant in a partially substituted mr triad is assumed. Other possibilities for that secondary process are discussed.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080240804
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  • 5
    Electronic Resource
    Electronic Resource
    An unexpected structure in the preparation of new epoxy resins (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 138 (1986), S. 185-192 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Spektroskopische Daten von Epoxidharzen, die aus Pyromellitsäuredianhydrid synthetisiert wurden, haben zwei Angriffsmöglichkeiten auf die zwei Kohlenstoffatome der Oxirangruppe gezeigt, indem sie der normalen und anormalen Öffnung des Ringes stattgeben. Die physikalischen Eigenschaften der Polymeren sowie ihre Löslichkeit werden beschrieben. Die thermische Analyse dieser Epoxidpolyesterimide zeigt deren gute Eigenschaften.
    Notes: Spectroscopic data of epoxy resins, derivatives of pyromellitimide, have shown two types of attack on the two carbons of the oxirane group, giving rise to normal and abnormal opening of the ring. Thus, primary and secondary hydroxy groups were obtained. The physical characteristics of the obtained new polymers and also their solubilities are reported. Thermal analysis of these epoxy polyesterimides showed their good thermal properties.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051380116
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and reactivity of new 3,3′,4,4′-tetracarboxybenzophenone dianhydride glycidyl ester derivatives (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 140 (1986), S. 113-125 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Neue Diimiddicarbonsäuremonomere und ihre entsprechenden Diglycidylester wurden aus 3,3′,4,4′-Benzophenontetracarbonsäuredianhydrid hergestellt. Die Synthese der Diglycidylester erfolgte durch Umsetzung mit Epichlorhydrin im Überschuß mit quaternären Ammoniumsalzen als Katalysator. Die synthetisierten Produkte wurden durch spektroskopische Methoden identifiziert und als Monomere in einer Stufenpolymerisation eingesetzt. Die neuen Epoxidharze zeigen durch den Einbau von Imid-Gruppen nicht nur eine höhere thermische Beständigkeit, sondern sie sind auch in polaren Lösungsmitteln gut löslich.
    Notes: New diimidediacids coming from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (TBPA) and their corresponding diglycidyl derivatives have been synthesized. Preparation of diglycidyl esters was carried out by reaction with epichlorohydrin (EPC) in excess and using a quaternary ammonium halide as catalyst. The obtained compounds were characterized by spectroscopic methods and employed as starting monomers in a stepwise polymerization. The presence of imide groups in the new epoxy resins confers them higher thermal stability and also acceptable processing possibilities, as they are soluble in high polar organic solvents.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051400109
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  • 7
    Electronic Resource
    Electronic Resource
    Glycosylation of Pyrazino[2,3-c]-1,2,6-thiadiazine 2,2-Dioxides to Sulfur Dioxide Analogs of Pteridine Nucleosides (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1872-1879 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Glycosylierungen von Pyrazino[2,3-c]-1,2,6-thiadiazin-2,2-dioxiden zu Schwefeldioxid-Analogen von Pteridin-NucleosidenDie Pyrazino[2,3-c]-1,2,6-thiadiazin-2,2-dioxide 1, 2 und 3 werden als Trimethylsilyl-Derivate mit 1-O-Acetylribose-Derivaten glycosyliert. 1 liefert ein Gemisch der N-1- und N-8-Monoriboside sowie das N-1,4-N-Diribosid, wobei die Produktverteilung von den Reaktionsbedingungen abhängt. Mit den 6,7-disubstituierten Pyrazino[2,3-c]-1,2,6-thiadiazinen 2 und 3 werden lediglich die N-1-Monoriboside gebildet. Die Strukturen der neu synthetisierten Verbindungen werden auf der Basis der UV-, 1H-NMR- und 2D-NMR-Spektren diskutiert und gesichert.
    Notes: Pyrazino[2,3-c]-1,2,6-thiadiazine 2,2-dioxides 1, 2, and 3 have been glycosylated as their trimethylsilyl derivatives with 1-O-acetyl derivatives of ribose. 1 leads to mixtures of N-1 and N-8 monoribosides and N-1,4-N diribosides, the relative proportions depending on the reaction conditions used. However, in the case of 6,7-disubstituted pyrazinothiadiazines 2 and 3 only the N-1 monoribosides have been obtained. The structures of the newly synthesized compounds are discussed on the basis of UV, 1H NMR and 2D homonuclear NMR data.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619861107
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  • 8
    Electronic Resource
    Electronic Resource
    Gas-phase thermolysis of sulfur compounds. Part VIII. Chloromethyl allyl, cyanomethyl allyl, 1-cyanoethyl allyl and neopentyl allyl sulfides (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 18 (1986), S. 355-362 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrolyses of four alkyl allyl sulfides with substituents on the α—C atom of the alkyl moiety have been studied in a stirred-flow system over the temperature range 340-400°C and pressures between 2 and 12 torr. The only products formed are propene and thioaldehydes. The reactions showed first-order kinetics with the rate coefficients following the Arrhenius equations: Chloromethyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{10.74 \pm 0.23} \exp ( - 144 \pm 3){\rm kJ/mol}RT $$\end{document} Cyanomethyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{10.20 \pm 0.19} \exp ( - 129 \pm 2){\rm kJ/mol}RT $$\end{document} 1-cyanoethyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{11.09 \pm 0.18} \exp ( - 141.5 \pm 2.2){\rm kJ/mol}RT $$\end{document} Neopentyl allyl sulfide: \documentclass{article}\pagestyle{empty}\begin{document}$$ k({\rm s}^{{\rm - 1}}) = 10^{10.54 \pm 0.24} \exp ( - 144 \pm 3){\rm kJ/mol}RT $$\end{document}The effects of these and other substituents on the reactivity is discussed in relation with the stabilization of a polar six-centered transition state. The results support a non-concerted mechanism where the 1-5 α—H atom shift is assisted by its acidic character.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550180308
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  • 9
    Electronic Resource
    Electronic Resource
    Complexes of IIB Metal Halides with N,N-Diethylbenzenecarbothioamide crystal structure of [Hg{C6H5C(S)N(C2H5)2}I2]2 (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 539 (1986), S. 219-228 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplexe von IIB Metall-halogeniden mit N,N-Diethylbenzocarbothioamiden. Kristallstruktur von [Hg{C6H5C(S)N(C2H5)2}I2]2Verschiedene Komplexe von N,N-Diethylbenzocarbothioamide (DEBCTA) mit MX2 (M = Zn, Cd oder Hg und X = Cl, Br oder I) wurden hergestellt und mittels Elementaranalyse, Molgewichtsbestimmung, IR, 1H-NMR-Spektren und konduktometrischen Messungen untersucht. Die Kristallstruktur von [Hg(DEBCTA)I2]2 wurde mit Hilfe von Röntgenbeugungsdaten ermittelt (2402 beobachtete unabhängige Reflexe, R = 0,097). [Hg(DEBCTA)I2]2 kristallisiert monoklin in der Raumgruppe P21/n mit zwei Formeleinheiten pro Elementarzelle; Gitterkonstanten a = 1383,9(2), b = 834,3(1), c = 1 418,1(2) pm, β = 101,03(1)°. Im dimeren Komplex sind die verzerrt-tetraedrisch koordinierten Hg-Atome von je einem S-Atom des Liganden, einem terminalen I-Atom und zwei verbrückenden I-Atomen umgeben.
    Notes: Complexes having the empirical formulae M(DEBCTA)2X2 (M = Zn or Cd, X = Br or I, DEBCTA = N,N-diethylbenzenecarbothioamide), Zn(DEBCTA)Cl2, Cd2(DEBCTA)Cl4 and Hg(DEBCTA)X2 (X = Cl, Br or I) were made by reaction of zinc, cadmium or mercury dihalides in ethanol or 1,2-dichloroethane. All complexes have been characterized by elemental analysis, conductance and molecular weight measurements and by infrared and 1H-NMR spectral studies. In addition, the structure of [Hg(DEBCTA)I2]2 has been determined by single-crystal X-ray crystallography and refined to a conventional R factor of 0.097. The compound crystallizes in the monoclinic space group P21/n with a = 1383.9(2), b = 834.3(1), c = 1418.2(2) pm, β = 101.03(1)° and Z = 2. The molecule was found to have a dimeric structure involving two asymmetrical iodine bridges in which the Hg atom lies a tetrahedral environment and the ligands lie mutually trans with respect to one another.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865390823
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  • 10
    Electronic Resource
    Electronic Resource
    Compositional heterogeneity in selective substitution of poly(vinyl chloride) (1986)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 7 (1986), S. 15-19 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1986.030070103
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